Siren



FIG. 1 is a front perspective view of the siren according to the present design;

FIG. 2 is a front elevational view of the siren of FIG. 1;

FIG. 3 is a rear elevational view of the siren of FIG. 1;

FIG. 4 is a left-side elevational view of the siren of FIG. 1;

FIG. 5 is a right-side elevational view of the siren of FIG. 1;

FIG. 6 is a top plan view of the siren of FIG. 1; and,

FIG. 7 is a bottom plan view of the siren of FIG. 1.

In the drawings, the broken lines showing the ring logo illustrate environmental structure that forms no part of the claimed design. The dash-dash broken lines shown in FIG. 3 illustrate portions of the siren that form no part of the claimed design. The dash-dot broken lines represent the bounds of the claim and form no part of the claimed design. 

CLAIM The ornamental design for a siren, as shown and described. 